A new metal-organic framework Zn2(H2O)(dobdc)·0.5(H2O) (UTSA-74, H4dobdc = 2,5-dioxido-1,4-benzenedicarboxylic acid), Zn-MOF-74/CPO-27-Zn isomer, has been synthesized and structurally characterized. It a novel four coordinated fgl topology with one-dimensional channels of about 8.0 Å. Unlike metal sites in the well-established MOF-74 rod-packing structure which each them is five coordinate square pyramidal coordination geometry, there are two different Zn(2+) within binuclear secondary...

Flexible metal-organic frameworks (MOFs) receive much attention owing to their attractive properties that originate from flexibility and dynamic behavior, show great potential applications in many fields. Here, recent progress the discovery, understanding, property investigations of flexible MOFs are reviewed, examples storage separation, sensing, guest capture release presented highlight developing trends MOFs.

Abstract The removal of acetylene from ethylene/acetylene mixtures containing 1% is a technologically very important, but highly challenging task. Current approaches include the partial hydrogenation over noble metal catalyst and solvent extraction cracked olefins, both which are cost energy consumptive. Here we report microporous metal–organic framework in suitable pore/cage spaces preferentially take up much more than ethylene while functional amine groups on surfaces further enforce their...

A microporous three-dimensional hydrogen-bonded organic framework (HOF-5) has been constructed from a new linker 4,4',4″,4‴-tetra(2,4-diamino-1,3,5-triazin-6-yl)tetraphenylethene. Activated HOF-5a exhibits stepwise N2 adsorption isotherm at 77 K, suggesting flexibility. The structure of activated established by powder X-ray diffraction studies, indicating significant contraction as-synthesized HOF-5 to ∼21% volume. shows moderately high porosity with Brunauer-Emmett-Teller (BET) surface area...

The relationship between morphology and function of ZnO is demonstrated by investigating its polar planes, oxygen vacancies, catalytic activity for N-formylation. with various morphologies controllably synthesized via simple hydrothermal reactions. Scanning electron microcopy images exhibit a variety the as-prepared hexagonal zinc oxides: rods, disks, rings, screw caps as new member family. Each remarkably different from others in proportion (0001) (0001̅) planes outside surfaces crystals....

With H2 O or NH3 stimuli, the blue cobalt-based metal-organic framework (MOF) BP can reversibly transform to red RP. The removal/recovery of terephthalate ligands accompanied by transformation leads a gate effect, which allows encapsulation and release small solvent molecules under certain conditions. This is first example topology from self-penetrating interpenetrating net in 3D MOFs.

Metal-organic frameworks (MOFs) constructed with metal ions/clusters and organic ligands have emerged as an important family of porous materials for various applications. However, the stability this class is crucial their practical applications, which might be improved by varying chemical composition and/or structurally tuning them. To fabricate MOFs high stability, several strategies enhancing been developed, in strength metal-ligand bonds especially considered: use highly charged cations...

A new luminescent ZnII -MOF with 1D triangular channels along the b axis, namely NUM-5, has been successfully assembled and well characterized, which features good stability, especially in aqueous solution. Interestingly, this compound exhibits a fast, sensitive selective luminescence quenching response towards CrVI (Cr2 O72- /CrO42- ) The detection limits Cr2 CrO42- ions are estimated to be 0.7 0.3 ppm, respectively, among lowest reported for MOF-based fluorescent probes that can...

Physical adsorption of gas molecules in microporous materials is an exothermic process, with desorption entropy driving a decrease uptake temperature. Enhanced sorption increasing temperature rare porous and indicative sorbate initiated structural change. Here, C2H6, C3H6, C3H8 flexible metal–organic framework (MOF) {Cu(FPBDC)]·DMF}n (NKU-FlexMOF-1) (H2FPBDC = 5-(5-fluoropyridin-3-yl)-1,3-benzenedicarboxylic acid) that increases rising over practically useful pressure range reported along...

One-step harvest of high-purity light hydrocarbons without the desorption process represents an advanced and highly efficient strategy for purification target substances. The separation acetylene (C2H2) from carbon dioxide (CO2) by CO2-selective adsorbents are urgently demanded yet very challenging owing to their similar physicochemical properties. Here, we employ pore chemistry adjust environment immobilizing polar groups into ultramicroporous metal-organic framework (MOF), achieving...

A diaminotriazine-decorated porphyrin-based microporous hydrogen-bonded organic framework has been successfully prepared and characterized using single crystal X-ray diffraction analysis. Its activated phase exhibits permanent porosity, gas separation, proton conductivity under humid conditions.

A new class of metal-organic frameworks (MOFs) has been synthesized by ligand-functionalization strategy. Systematic studies their adsorption properties were performed at low and high pressure. Importantly, when fluorine was introduced into the framework via functionalization, both stabilities capacities towards H2/CO2 enhanced significantly. This consequence can be well interpreted theoretical these MOFs structures. In addition, one TKL-107 used to fabricate mixed matrix membranes, which...

Organic donor-acceptor systems have attracted much attention due to their various potential applications. However, the rational construction and modulation of highly ordered could be a challenge complicated self-assembly process donor acceptor species. Considering well-defined arrangement species at molecule level, crystalline host-guest system an ideal platform for systems. Herein, it is shown how tunable materials can achieved based on platform. Within well-established metal-organic...

Seven new d10 metal coordination polymers with isomeric benzenedicarboxylates and 3-(2-pyridyl)pyrazole ligands, [Zn2L2(1,2-BDC)(H2O)]n (1), {[Cd2(HL)2(1,2-BDC)2]·H2O}n (2), [Cd(HL)(1,2-BDC)(H2O)]n (3), [Zn(HL)(1,3-BDC)(H2O)·3H2O]n (4), [Cd2L2(1,3-BDC)(H2O)]n (5), [Zn(HL)2(1,4-BDC)]n (6) [Cd(HL)2(1,4-BDC)]n (7) (BDC = benzenedicarboxylate, HL 3-(2-pyridyl)pyrazole), have been synthesized structurally characterized by elemental analysis, IR X-ray diffraction. Single-crystal analyses reveal...

A polypyridyl ligand, 2,3,6,7,10,11-hexakis(2-pyridyl)dipyrazino[2,3-f:2',3'-h]quinoxaline (HPDQ), was found to have excellent fluorescent selectivity for Cd(2+) over many other metal ions (K(+), Na(+), Ca(2+), Mg(2+), Mn(2+), Fe(2+), Ni(2+), Co(2+), Cu(2+), Ag(+), Hg(2+), Zn(2+), and Cr(3+)) based on the intramolecular charge-transfer mechanism, which makes HPDQ a potential fluorescence sensor or probe Cd(2+). An obvious color change between + can be visually observed by naked eye. The...

The enantiomers of complex 1 (1a and 1b) have been obtained by spontaneous resolution upon crystallization in the absence a chiral source. enantiomeric nature 1a 1b was confirmed circular dichroism (CD) spectra theoretical investigation.

5-(1H-Tetrazol-1-yl)isophthalic acid (H(2)L) reacts with Cu(II) ion forming a new metal-organic framework {[CuL]·DMF·H(2)O}(∞) (1) (DMF = N,N-dimethylformamide), rutile-related type net topology. Compound 1 possesses 3D structure 1D channels that can be desolvated to yield microporous material. Adsorption properties (N(2), H(2), O(2), CO(2), and CH(4)) of the solid [CuL] (1a) have been studied, results exhibit 1a fairly good capability gas sorption for N(2), CO(2) gases, high selectivity...

A new three-dimensional (3D) metal–organic framework exhibits high sensitivity and selectivity for Al³⁺ ions as a “turn on” fluorescent sensor.

A new manganese(II) coordination polymer, [Mn2(L1)4/3(L2)2]n (1) (L1 = 4′-(4-pyridyl)-4,2′:6′,4″-terpyridine, H2L2 (4-phenyl)-2,6-bis(4-carboxyphenyl)pyridine), has been prepared and structurally characterized. Complex 1 is a 2-fold interpenetrated three-dimensional framework, which to our knowledge represents the first interpenetration example of framework with unique (3,6)-connected loh1 topology. Furthermore, magnetic properties photocatalytic activity have investigated. As result,...

In our efforts toward rational design and systematic synthesis of 'pillar–layer' structure MOFs, three porous MOFs have been constructed based on [Zn4(bpta)2(H2O)2] (H4bpta = 1,1′-biphenyl-2,2′,6,6′-tetracarboxylic acid) layers different bipyridine pillar ligands. The resulted show similar structures but pore volume window size depending the length ligands which in distinct gas adsorption properties. [Zn4(bpta)2(4,4′-bipy)2(H2O)2]·(DMF)3·H2O (1) (DMF N,N′-dimethylformamide 4,4′-bipy...

Two solvent-induced porous hydrogen-bonded organic frameworks have been obtained, and their synthesis, crystal structures, gas sorption behaviours fluorescence sensing applications systematically investigated to elucidate the solvent effects on structures functionalities of HOFs.

A novel non-interpenetrated three-dimensional porous metal–organic framework UTSA-68 has been controllably synthesized by altering the reaction conditions.